import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 */
public class Test4 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        int c = sc.nextInt();
        int s = sc.nextInt();
        double num = c * 1.0 / t;
        int count = s - c;
        double time = count / num;
        if(time % 1 != 0) {
            time += 1;
        }
        int ans = (int)time;
        System.out.println(ans);
    }
}
